<template>
    <div id="app">
        <div class="model" v-show="model" @click="model = false">
            <div class="model-show">
                <img :src="modelSrc" alt="">
            </div>
        </div>
        <p style="color: #000;">截图demo</p>
        <div class="cut">
            <vue-cropper
                ref="cropper"
                :img="option.img"
                :output-size="option.size"
                :output-type="option.outputType"
                :info="true"
                :full="option.full"
                :fixed="fixed"
                :fixed-number="fixedNumber"
                :can-move="option.canMove"
                :can-move-box="option.canMoveBox"
                :fixed-box="option.fixedBox"
                :original="option.original"
                :auto-crop="option.autoCrop"
                :auto-crop-width="option.autoCropWidth"
                :auto-crop-height="option.autoCropHeight"
                :center-box="option.centerBox"
                @real-time="realTime"
                :high="option.high"
                @img-load="imgLoad"
                mode="cover">
            </vue-cropper>
            <div class="show-preview"
                 :style="{'width': previews.w + 'px', 'height': previews.h + 'px',  'overflow': 'hidden', 'margin': '5px'}">
                <div :style="previews.div">
                    <img :src="previews.url" :style="previews.img">
                </div>
            </div>
        </div>
        <div class="test-button">
            <button @click="changeImg" class="btn">changeImg</button>
            <label class="btn" for="uploads">upload</label>
            <input
                type="file"
                id="uploads"
                style="position:absolute; clip:rect(0 0 0 0);"
                accept="image/png, image/jpeg, image/gif, image/jpg"
                @change="uploadImg($event, 1)"
            >
            <button @click="startCrop" v-if="!crap" class="btn">开始</button>
            <button @click="stopCrop" v-else class="btn">结束</button>
            <button @click="clearCrop" class="btn">清空</button>
            <button @click="refreshCrop" class="btn">刷新</button>
            <button @click="changeScale(1)" class="btn">放大</button>
            <button @click="changeScale(-1)" class="btn">缩小</button>
            <button @click="rotateLeft" class="btn">向右旋转90</button>
            <button @click="rotateRight" class="btn">向左旋转90</button>
            <button @click="finish('base64')" class="btn">预览(base64)</button>
            <button @click="finish('blob')" class="btn">预览(blob)</button>
            <a @click="down('base64')" class="btn">下载(base64)</a>
            <a @click="down('blob')" class="btn">下载(blob)</a>
            <div style="display:block; width: 100%;color: #000;">
                <label class="c-item">
                    <span>上传图片是否显示原始宽高 (针对大图 可以铺满)</span>
                    <input type="checkbox" v-model="option.original">
                    <span>original: {{ option.original }}</span>
                </label>
                <label class="c-item">
                    <span>能否拖动图片</span>
                    <input type="checkbox" v-model="option.canMove">
                </label>
                <label class="c-item">
                    <span>能否拖动截图框</span>
                    <input type="checkbox" v-model="option.canMoveBox">
                    <span>canMoveBox: {{ option.canMoveBox }}</span>
                </label>
                <label class="c-item">
                    <span>截图框固定大小</span>
                    <input type="checkbox" v-model="option.fixedBox">
                    <span>fixedBox: {{ option.fixedBox }}</span>
                </label><label class="c-item">
                <span>是否输出原图比例的截图</span>
                <input type="checkbox" v-model="option.full">
                <span>full: {{ option.full }}</span>
            </label>
                <label class="c-item">
                    <span>是否自动生成截图框</span>
                    <input type="checkbox" v-model="option.autoCrop">
                    <span>autoCrop: {{ option.autoCrop }}</span>
                </label>
                <label class="c-item">
                    <span>是否根据dpr生成适合屏幕的高清图片</span>
                    <input type="checkbox" v-model="option.high">
                    <span>high: {{ option.high }}</span>
                </label>
                <label class="c-item">
                    <span>截图框是否限制在图片里(只有在自动生成截图框时才能生效)</span>
                    <input type="checkbox" v-model="option.centerBox">
                    <span>centerBox: {{ option.centerBox }}</span>
                </label>
                <label class="c-item">
                    <p>输出图片格式</p>
                    <label>jpg
                        <input type="radio" name="type" value="jpeg" v-model="option.outputType">
                    </label>
                    <label>png
                        <input type="radio" name="type" value="png" v-model="option.outputType">
                    </label>
                    <label>webp
                        <input type="radio" name="type" value="webp" v-model="option.outputType">
                    </label>
                </label>
            </div>
        </div>
    </div>
</template>

<script>
import {VueCropper} from 'vue-cropper'

export default {
    name: 'ScreenShotDemo',
    components: {
        VueCropper
    },
    data () {
        return {
            model: false,
            modelSrc: '',
            crap: false,
            previews: {},
            lists: [
                {
                    img: 'https://qn-qn-kibey-static-cdn.app-echo.com/goodboy-weixin.PNG'
                },
                {
                    img: 'https://avatars2.githubusercontent.com/u/15681693?s=460&v=4'
                }
            ],
            option: {
                // 裁剪图片的地址
                img: 'https://qn-qn-kibey-static-cdn.app-echo.com/goodboy-weixin.PNG',
                // 裁剪生成图片的质量
                size: 1,
                // 输出原图比例截图 props名full
                full: false,
                // 裁剪生成图片的格式
                outputType: 'png',
                // 上传图片是否可以移动
                canMove: true,
                // 固定截图框大小 不允许改变
                fixedBox: false,
                // 上传图片按照原始比例渲染
                original: false,
                // 截图框能否拖动
                canMoveBox: true,
                // 是否默认生成截图框
                autoCrop: false,
                // 只有自动截图开启 宽度高度才生效
                // 默认生成截图框宽度
                autoCropWidth: 200,
                // 默认生成截图框高度
                autoCropHeight: 150,
                // 截图框是否被限制在图片里面
                centerBox: false,
                // 是否按照设备的dpr 输出等比例图片
                high: true
            },
            show: true,
            // 是否开启截图框宽高固定比例
            fixed: false,
            // 截图框的宽高比例
            fixedNumber: [1, 2],
            // 裁剪框的大小信息
            info: true,
            // canScale 图片是否允许滚轮缩放
            canScale: true,
            // infoTrue  true 为展示真实输出图片宽高 false 展示看到的截图框宽高:
            infoTrue: true,
            // maxImgSize  限制图片最大宽度和高度
            maxImgSize: 2000,
            // enlarge 图片根据截图框输出比例倍数
            enlarge: 1,
            // mode  图片默认渲染方式
            mode: 'contain'
        }
    },
    methods: {
        /**
         * 内置方法 通过this.$refs.cropper 调用
         this.$refs.cropper.startCrop() 开始截图
         this.$refs.cropper.stopCrop() 停止截图
         this.$refs.cropper.clearCrop() 清除截图
         this.$refs.cropper.changeScale() 修改图片大小 正数为变大 负数变小
         this.$refs.cropper.getImgAxis() 获取图片基于容器的坐标点
         this.$refs.cropper.getCropAxis() 获取截图框基于容器的坐标点
         this.$refs.cropper.goAutoCrop 自动生成截图框函数
         this.$refs.cropper.rotateRight() 向右边旋转90度
         this.$refs.cropper.rotateLeft() 向左边旋转90度
         图片加载的回调 imgLoad 返回结果success, error
         获取截图信息
         this.$refs.cropper.cropW 截图框宽度
         this.$refs.cropper.cropH 截图框高度
         */
        changeImg () {
            this.option.img = this.lists[~~(Math.random() * this.lists.length)].img
        },
        startCrop () {
            // start
            this.crap = true
            this.$refs.cropper.startCrop()
        },
        stopCrop () {
            //  stop
            this.crap = false
            this.$refs.cropper.stopCrop()
        },
        clearCrop () {
            // clear
            this.$refs.cropper.clearCrop()
        },
        refreshCrop () {
            // clear
            this.$refs.cropper.refresh()
        },
        changeScale (num) {
            num = num || 1
            this.$refs.cropper.changeScale(num)
        },
        rotateLeft () {
            this.$refs.cropper.rotateLeft()
        },
        rotateRight () {
            this.$refs.cropper.rotateRight()
        },
        finish (type) {
            // 输出
            // var test = window.open('about:blank')
            // test.document.body.innerHTML = '图片生成中..'
            if (type === 'blob') {
                this.$refs.cropper.getCropBlob((data) => {
                    console.log(data)
                    var img = window.URL.createObjectURL(data)
                    this.model = true
                    this.modelSrc = img
                })
            } else {
                this.$refs.cropper.getCropData((data) => {
                    this.model = true
                    this.modelSrc = data
                })
            }
        },
        // 实时预览函数
        realTime (data) {
            this.previews = data
            this.$emit('', this.previews)
            console.log(data)
        },

        finish2 (type) {
            this.$refs.cropper2.getCropData((data) => {
                this.model = true
                this.modelSrc = data
            })
        },
        finish3 (type) {
            this.$refs.cropper3.getCropData((data) => {
                this.model = true
                this.modelSrc = data
            })
        },
        down (type) {
            // event.preventDefault()
            var aLink = document.createElement('a')
            aLink.download = 'demo'
            // 输出
            if (type === 'blob') {
                this.$refs.cropper.getCropBlob((data) => {
                    this.downImg = window.URL.createObjectURL(data)
                    aLink.href = window.URL.createObjectURL(data)
                    aLink.click()
                })
            } else {
                this.$refs.cropper.getCropData((data) => {
                    this.downImg = data
                    aLink.href = data
                    aLink.click()
                })
            }
        },
        uploadImg (e, num) {
            // 上传图片
            // this.option.img
            var file = e.target.files[0]
            if (!/\.(gif|jpg|jpeg|png|bmp|GIF|JPG|PNG)$/.test(e.target.value)) {
                alert('图片类型必须是.gif,jpeg,jpg,png,bmp中的一种')
                return false
            }
            var reader = new FileReader()
            reader.onload = (e) => {
                let data
                if (typeof e.target.result === 'object') {
                    // 把Array Buffer转化为blob 如果是base64不需要
                    data = window.URL.createObjectURL(new Blob([e.target.result]))
                } else {
                    data = e.target.result
                }
                if (num === 1) {
                    this.option.img = data
                } else if (num === 2) {
                    this.example2.img = data
                }
            }
            // 转化为base64
            // reader.readAsDataURL(file)
            // 转化为blob
            reader.readAsArrayBuffer(file)
        },
        imgLoad (msg) {
            console.log(msg)
        }
    }
}
</script>

<style lang="less" scoped>
.cut {
    width: 500px;
    height: 500px;
    margin: 30px auto;
}

.c-item {
    max-width: 800px;
    margin: 10px auto;
    margin-top: 20px;
}

.content {
    margin: auto;
    max-width: 1200px;
    margin-bottom: 100px;
}

.test-button {
    display: flex;
    flex-wrap: wrap;
    align-content: center;
    justify-content: center;
}

.btn {
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    background: #fff;
    border: 1px solid #c0ccda;
    color: #1f2d3d;
    text-align: center;
    box-sizing: border-box;
    outline: none;
    margin: 20px 10px 0px 0px;
    padding: 9px 15px;
    font-size: 14px;
    border-radius: 4px;
    color: #fff;
    background-color: #50bfff;
    border-color: #50bfff;
    transition: all .2s ease;
    text-decoration: none;
    user-select: none;
}

.des {
    line-height: 30px;
}

code.language-html {
    padding: 10px 20px;
    margin: 10px 0px;
    display: block;
    background-color: #333;
    color: #fff;
    overflow-x: auto;
    font-family: Consolas, Monaco, Droid, Sans, Mono, Source, Code, Pro, Menlo, Lucida, Sans, Type, Writer, Ubuntu, Mono;
    border-radius: 5px;
    white-space: pre;
}

.show-info {
    margin-bottom: 50px;
}

.show-info h2 {
    line-height: 50px;
}

.title {
    display: block;
    text-decoration: none;
    text-align: center;
    line-height: 1.5;
    margin: 20px 0px;
    background-image: -webkit-linear-gradient(left, #3498db, #f47920 10%, #d71345 20%, #f7acbc 30%, #ffd400 40%, #3498db 50%, #f47920 60%, #d71345 70%, #f7acbc 80%, #ffd400 90%, #3498db);
    color: transparent;
    -webkit-background-clip: text;
    background-size: 200% 100%;
    animation: slide 5s infinite linear;
    font-size: 40px;
}

.test {
    height: 500px;
}

.model {
    position: fixed;
    z-index: 10;
    width: 100vw;
    height: 100vh;
    overflow: auto;
    top: 0;
    left: 0;
    background: rgba(0, 0, 0, 0.8);
}

.model-show {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
}

.model img {
    display: block;
    margin: auto;
    max-width: 80%;
    user-select: none;
    background-position: 0px 0px, 10px 10px;
    background-size: 20px 20px;
    background-image: linear-gradient(45deg, #eee 25%, transparent 25%, transparent 75%, #eee 75%, #eee 100%), linear-gradient(45deg, #eee 25%, white 25%, white 75%, #eee 75%, #eee 100%);
}

.c-item {
    display: block;
    user-select: none;
}

@keyframes slide {
    0% {
        background-position: 0 0;
    }
    100% {
        background-position: -100% 0;
    }
}
</style>
